// flex布局
.c-flex {
  display: flex;
  display: -webkit-flex;
  justify-content: center;
  align-items: center;
}
.b-flex {
  display: flex;
  display: -webkit-flex;
  justify-content: space-between;
  align-items: center;
}
.positionCenter {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
}
